A helicopter collided with overhead power lines and fell onto a barge in the Mississippi River close to Alton, Missouri, resulting in the deaths of two individuals.

The crash caused a fireball, captured in viral videos. Officials confirmed no injuries on the barge and no hazardous leaks.

The FAA and NTSB are investigating. Roads near the site were briefly closed. The victims' identities and the helicopter’s purpose remain unknown, though it may have been doing powerline work.